GitHub

Arduino library for RS485 communication.

RS485 is an experimental library to make half duplex communication easier. The library implements the Stream interface so the user can use print() and write() calls just like one does with Serial.
GitHub

Arduino RS485 library for ESP32

Arduino library implementing RS485 half duplex serial interface for ESP32. Automatic detects of transmission start and complete events to change the state of the transmission direction pin.
Electronics Weekly

Electronica: Arduino makes single-pair Ethernet accessible, and RS485 too

Arduino announced a single-pair Ethernet adapter board for its Uno R4 single-board microcontroller at Electronica this morning. Microchip participated in the development – its LAN8651B1T-E/LMX single ...
CNX Software

Arduino UNO SPE Shield adds Single Pair Ethernet and RS485 to Arduino boards

Arduino UNO SPE Shield adds Single Pair Ethernet (SPE) and RS485 to Arduino UNO and compatible boards, notably the Arduino UNO R4, via a Microchip LAN8651 SPE controller. Single Pair Ethernet relies ...